Gage foe mortising machines



(No Model.)

G. L. MUHN.

GAGE FOR MORTISING MACHINES.

m g T E N N H m m m 2 "En $5 NITED STATES PATENT FFICE.

GEORGE L. MUHN, OF WHEELING, WEST VIRGINIA, ASSIGNOR F ONE-HALF TO JAMESH. MOGEE, OF SAME PLACE.

GAGE FOR MORTlSlNG-MACHINES.

SPECIFICATION forming part of Letters Patent No. 249,784, dated November22, 1881,

(No model.)

To all whom it may concern Be it known that I, GEORGE L. MUHN, aresident of Wheeling, in the-county of Ohio and State of West Virginia,have invented certain new and useful Improvements in Mortising-MachineGages; and I do hereby declare that the following is a full, clear, andexact description of the invention, which will enable others skilled inthe art to which it appertains to make and use the same, reference beinghad to the accompanying drawings, and to letters of reference markedthereon, which form a part of this specification.

The object of my invention is to provide a means to regulate the numberand size of mortises to be made in the material without having to layoft the same on each separate piece of stuff, and also to insureaccuracyin cutting up to the scribe, and avoiding liability ofunder orover cutting the mark, as is the case where the mortising is done byhand; and to this end my invention consists in the combination, with thetable of a mortising-machine,of a sliding gage-bar, having adjustablestuds on the up- 2 5 per edge, which, in connection with a stationarystop on the standard of machine, regulates the number and length of themortises, and provided also with adjustable clamps or stopblocks at eachend, to secure the material and 0 hold it in place while it is beingmortised.

In the drawings, Figure 1 is a perspective view of a mortising maehinewith my device attached to the table of the machine; Fig. 2, end view,showing relative position of the 3 5 gage-bar and material with themortisin g-chisel of the machine; Fig. 3, view of the mortisestop onstandard of machine; Figs. 4 and 5, enlarged side view and section ofthe gage-bar and track.

In the drawings like letters of reference refor to like parts.

The letter A designates a mortising-machine similar to those in generaluse, termed a treadle-feed machine; B, the table for sup- 4 5 portingthe material to be mortised; L, piece of wood to be mortised; O, thechisel; D, the treadle to raise the table.

E is a flat bar, of any desired length, suitable for the purpose it isto be used, having suitable size square grooves, a a a, plowedlengthwise in its sides.

F is a channel-bar with the edges 12 1) projecting inward and e hgagingwith the grooves in the bar E, which slides through it. This channel-baris attached to thetable of the machine and moves up and down with it.

WVhen it is required to mortiselong stud and to prevent the ends of thegrooved gage-bar from sagging or bearing down from a level plane anextension-piece, m,is attached to each end of the channel-bar by meansof a slidinggroove connection or other well-known ways, by which thetrack thus formed can be extended to any desired length.

G G are adjustable gages or stops secured to the upper edge of theslide-bars by a tongueconnection with a thumb-bolt to each to secure itin place. These pins are for the purpose of gaging the length of themortise and operate in connection with a stop-pin, H, projecting fromthe standard of the machine on a horizontal line with themortising-chisel and directlyback of the same. The stop H is madeadjustable vertically, to suit different widths of material, and is alsomade with a shoulderjoint to permit of it rising up when it is appliedtocertain kinds of machines where the gage-bar would have to passitbefore the chisel would reach its required depthsuch, for instance, asthat class of machines known as chisel-bar-feed machines, the devicebeing applicable to' both classes of mortising-inachines. The stop-pin Hand the mortise gagepins G G are made preferably square or fiatsidedwhere they engage with each other. The 8 5 gage-pins G G can beincreased in number according to the number of mortises to be made inthe material, the length of the mortises being regulated by the distanceof one the other.

K K are stop-blocks, adjustably connectedby a tongue-and-pin connectionto the gagebar, one at each end, for the purpose of clamping the ends ofthe material and holding it firm in connection with the gage-bar moving5 with the same. These stop-blocks permit of the niaterial'bein greversed during the process pinfrom of mortisin g to change the relativeposition of the mortises, if so desired; or the slide-bar can bewithdrawn from its connection and reversed to change the position of themortises. By the aid of this gage-bar the length and numof a movablegage-bar, E, having gage-pins G,

and the adjustable stop-pin H, secured to the 1 standard of the machineand constructed with a loose joint to permit the pin to turn up out ofthe way of the gage-bar.

In testimony that I claim the foregoing as my own, I hereunto afiix mysignature, in pres 2o ence of two witnesses.

GEORGE L. MUHN.

Witnesses:

E. B. HOWARD, JAMES MoGEE.

